Bending experimental study and crack width calculation method of high-strength concrete beams reinforced with BFRP bars and steel fiber

被引：0

作者：

Zhu H. ^{[1
,2
]}

Cheng S. ^{[2
,3
]}

Gao D. ^{[1
,2
]}

Cui G. ^{[4
]}

机构：

[1] College of Civil Engineering, Henan University of Engineering, Zhengzhou

[2] School of Water Conservancy Science & Engineering, Zhengzhou University, Zhengzhou

[3] China Construction Seventh Engineering Division Corp., Ltd, Zhengzhou

[4] Yellow River Engineering Consult Corp., Ltd, Zhengzhou

来源：

Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷 / 06期

关键词：

BFRP bar; Flexural crack; Flexural test; High-strength concrete beam; Steel fiber;

D O I：

10.14006/j.jzjgxb.2018.0333

中图分类号：

学科分类号：

摘要：

Large deflection and crack width significantly affect the serviceability of concrete beams reinforced with FRP bars. The addition of steel fibers can effectively restrain the development of deflection and crack width of FRP bar-reinforced concrete beams. In order to investigate the influences of steel fiber volume fraction, depth of steel fiber reinforced concrete layer of tensile zone and ratio of basalt fiber reinforced polymer(BFRP) reinforcement on distribution and width of flexural crack of high-strength concrete beams, 12 specimens were cast and tested. The results indicate that the addition of steel fibers restrains the development of crack space and width. Compared with the beam reinforced with BFRP bars, when the applied load reaches to 100 kN, the beam reinforced with BFRP bars and steel fibers with the fraction of 0.5%-2.0% can reduce the crack width by 25.22%-54.78% and the deviation of crack width by 10.00%-68.18%. When the depth of steel fiber reinforced concrete layer is 0.57 times of the height of specimens, the steel fibers produce the same effect on restraining cracks as fully steel fiber reinforced beams. This indicates that adding steel fibers in tensile zone is an economical and effective way to restrain the propagation of cracks in BFRP bars-reinforced concrete beams. Based on the test and theoretical analysis, the calculating method, which can be used for evaluating the crack width of high-strength concrete beams reinforced with BFRP bars and steel fiber, was proposed. The calculated values have good agreement with the test results. © 2020, Editorial Office of Journal of Building Structures. All right reserved.

引用

页码：133 / 142

页数：9

共 22 条

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